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ROSAI-DORFMAN DISEASE Figure 1-11 ROSAI-DORFMAN DISEASE A: Alternating pale and dark areas at low power are characteristic of this condition. B: The pale areas are made up of large histiocytes with abundant eosinophilic cytoplasm. Emperipolesis is the presence of lymphocytes within More about this image found in ROSAI-DORFMAN DISEASE A: Alternating pale and dark areas at low power are ...

SINONASAL NONKERATINIZING SQUAMOUS CELL CARCINOMA Figure 1-32 SINONASAL NONKERATINIZING SQUAMOUS CELL CARCINOMA A: At low power, the polypoid sinonasal mucosa shows rounded basaloid nests growing downward in the subepithelium. This appearance is reminiscent of inverted sinonasal papilloma More about this image found in SINONASAL NONKERATINIZING SQUAMOUS CELL CARCINOMA A: At low power, the pol...

LOW-GRADE NONINTESTINAL SINONASAL ADENOCARCINOMA Figure 1-48 LOW-GRADE NONINTESTINAL SINONASAL ADENOCARCINOMA A,B: At low power, there are far more seromucinous glands than normal for the sinonasal contents. C,D: At high power, there is architectural atypia in the form of gland fusion More about this image found in LOW-GRADE NONINTESTINAL SINONASAL ADENOCARCINOMA A,B: At low power, there ...

HPV-RELATED MULTIPHENOTYPIC SINONASAL CARCINOMA Figure 1-54 HPV-RELATED MULTIPHENOTYPIC SINONASAL CARCINOMA A: At low power, most tumors are solid nests and sheets of basaloid cells. B: Cribriform growth is noted in some cases, seen here on the bottom right. More about this image found in HPV-RELATED MULTIPHENOTYPIC SINONASAL CARCINOMA A: At low power, most tumo...

LOBULAR CAPILLARY HEMANGIOMA Figure 1-69 LOBULAR CAPILLARY HEMANGIOMA Polypoid masses on low power. A: Surface ulceration with a collarette of metaplastic squamous epithelium. B: Lobules of capillaries within a fibrous stroma. C: Extensively hyalinized tumor with myxoid change and surface More about this image found in LOBULAR CAPILLARY HEMANGIOMA Polypoid masses on low power. A: Surface ulc...

MYCOBACTERIAL SPINDLE CELL TUMOR Figure 1-96 MYCOBACTERIAL SPINDLE CELL TUMOR A: Low power shows an intact surface with a spindled cell proliferation. B: The surface is ulcerated, with spindled cells noted in the stroma. C: The lesional histiocytes have a spindled morphology, with inflammatory More about this image found in MYCOBACTERIAL SPINDLE CELL TUMOR A: Low power shows an intact surface with...

EMBRYONAL RHABDOMYOSARCOMA Figure 1-119 EMBRYONAL RHABDOMYOSARCOMA A: At low power, this subtype of rhabdomyosarcoma is often concentrated beneath the surface epithelium. B: At high power, the primitive spindled cells with hyperchromatic nuclei are set in a myxoid stroma. Inset: Desmin More about this image found in EMBRYONAL RHABDOMYOSARCOMA A: At low power, this subtype of rhabdomyosarco...

NASAL CHONDROMESENCHYMAL HAMARTOMA Figure 1-172 NASAL CHONDROMESENCHYMAL HAMARTOMA A: Low-power shows a polypoid mass containing bands of hyaline cartilage. B: At higher power, there are nodules of mature cartilage in the background of a loose fibromyxoid stroma. More about this image found in NASAL CHONDROMESENCHYMAL HAMARTOMA A: Low-power shows a polypoid mass cont...

SINONASAL TERATOCARCINOSARCOMA Figure 1-173 SINONASAL TERATOCARCINOSARCOMA A: At low power, the tumor is very heterogeneous. B: At higher power, the tumor is made up of numerous tumor cell components, including teratoid glands, spindled cells, and primitive small round cells. More about this image found in SINONASAL TERATOCARCINOSARCOMA A: At low power, the tumor is very heteroge...

NORMAL ANATOMY OF THE TONSILLAR TISSUES Figure 2-1 NORMAL ANATOMY OF THE TONSILLAR TISSUES At low power, portions of the oropharynx show invaginated crypt epithelium intimately associated with organized lymphoid tissue with prominent germinal centers. More about this image found in NORMAL ANATOMY OF THE TONSILLAR TISSUES At low power, portions of the orop...

OROPHARYNGEAL NONKERATINIZING SQUAMOUS CELL CARCINOMA Figure 2-10 OROPHARYNGEAL NONKERATINIZING SQUAMOUS CELL CARCINOMA High-power view shows a nonkeratinizing SCC with hyperchromatic nuclei, no maturing squamous differentiation, and smooth nest borders with no stromal reaction. More about this image found in OROPHARYNGEAL NONKERATINIZING SQUAMOUS CELL CARCINOMA High-power view show...

OROPHARYNGEAL SMALL CELL CARCINOMA Figure 2-29 OROPHARYNGEAL SMALL CELL CARCINOMA High-power view shows the stippled (or salt and pepper) chromatin pattern and the teardrop shape in which one portion of the nucleus is pointed. More about this image found in OROPHARYNGEAL SMALL CELL CARCINOMA High-power view shows the stippled (or ...

OROPHARYNGEAL SECRETORY CARCINOMA Figure 2-40 OROPHARYNGEAL SECRETORY CARCINOMA Medium power shows nests of eosinophilic cells with round to oval nuclei and abundant, irregular, luminal spaces, many of which with variably eosinophilic to lightly basophilic secretions (asterisks). More about this image found in OROPHARYNGEAL SECRETORY CARCINOMA Medium power shows nests of eosinophilic...

OROPHARYNGEAL DIFFUSE LARGE B-CELL LYMPHOMA Figure 2-41 OROPHARYNGEAL DIFFUSE LARGE B-CELL LYMPHOMA Low-power view shows effacement of the normal tonsillar lymphoid tissue. More about this image found in OROPHARYNGEAL DIFFUSE LARGE B-CELL LYMPHOMA Low-power view shows effacemen...

PLEOMORPHIC ADENOMA Figure 4-65 PLEOMORPHIC ADENOMA A: Characteristic low-power image shows varying patterns with chondromyxoid stroma and a putative fibrous capsule (arrow). B: Tubular and ductal structures are seen within a cellular fibrous stroma. C: Plasmacytoid cells with eccentric nuclei More about this image found in PLEOMORPHIC ADENOMA A: Characteristic low-power image shows varying patter...

CALCIFYING EPITHELIAL ODONTOGENIC TUMOR Figure 5-57 CALCIFYING EPITHELIAL ODONTOGENIC TUMOR Low-power view shows a mixture of epithelial cells, amyloid protein, and calcification. More about this image found in CALCIFYING EPITHELIAL ODONTOGENIC TUMOR Low-power view shows a mixture of ...

ADENOID AMELOBLASTOMA Figure 5-67 ADENOID AMELOBLASTOMA A: Low-power view of an epithelial tumor with numerous duct-like spaces producing a cribriform pattern. B: Basaloid epithelial cells with numerous duct-like spaces lined by columnar epithelium. Cells at the periphery of the sheets More about this image found in ADENOID AMELOBLASTOMA A: Low-power view of an epithelial tumor with numero...

AMELOBLASTIC FIBROMA Figure 5-70 AMELOBLASTIC FIBROMA Low-power view of characteristic lamina-like strands of odontogenic epithelium in a highly cellular embryonal ectomesenchymal stroma. More about this image found in AMELOBLASTIC FIBROMA Low-power view of characteristic lamina-like strands ...

AMELOBLASTIC FIBROMA Figure 5-71 AMELOBLASTIC FIBROMA High-power photomicrograph shows lack of cytologic atypia in the epithelial or mesenchymal components. More about this image found in AMELOBLASTIC FIBROMA High-power photomicrograph shows lack of cytologic at...

CALCIFYING ODONTOGENIC CYST Figure 5-175 CALCIFYING ODONTOGENIC CYST Low-power photomicrograph depicting a cyst with variable thickness. The collections of larger eosinophilic cells within the luminal epithelium are ghost cells. More about this image found in CALCIFYING ODONTOGENIC CYST Low-power photomicrograph depicting a cyst wit...